<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <button id="connect">连接</button>
    <button id="send" disabled="true">发送数据</button>
    <br>
    <br>
    <br>
    从服务端接收的数据：
    <br>
    <br>
    <br>
    <span id="recv"></span>

    <script>
        const connect = document.querySelector('#connect')
        const send = document.querySelector('#send')
        const recv = document.querySelector('#recv')

        let ws = null

        connect.onclick = function(){
            ws = new WebSocket("ws://localhost:9998")
            ws.onopen = () => {
                console.log('服务端连接成功...')
                send.disabled = false
            }
            ws.onclose = () => {
                console.log('服务端连接失败...')
                send.disabled = true
            }
            ws.onmessage = msg => {
                console.log('接收到服务端发送的数据')
                console.log(msg)
                recv.innerHTML = msg.data
            }
        }

        send.onclick = function(){
            ws.send(JSON.stringify({
                action: 'getData',
                socketType: 'trendData',
                chartName: 'trend',
                value: ''
            }))
        }

    </script>
</body>
</html>